| 382 Communications | 8x8 Inc. |
| Airespring, Inc. | Albany Mutual Telephone Association |
| Allstream Business US, LLC | Armstrong Telecommunications, Inc |
| Assurance Telecom, LLC | AT&T |
| Atlantech Online Inc. | Bandwidth.com CLEC, LLC |
| Big River Telephone | Block Line Systems, LLC |
| Brightlink Communications LLC | Broadband Dynamics LLC |
| Bulloch County Rural Telephone Cooperative, Inc | Carnegie Telephone Company Inc. |
| Charter Communications, Inc. | Clear Rate Communications, Inc |
| Comcast IP Phone, LLC | Commio |
| Computer Telephony Innovations Inc. dba Voxtelesys | Consolidated Communications |
| CORETEL VIRGINIA, LLC | Cox Communications, Inc. |
| Digital Agent | digitalIPvoice, Inc |
| Fidelity Communications | FirstDigital Telecom LLC |
| Frontier Communications | Greenfly Networks Inc dba Clearfly Communications |
| Hadlo Technologies, LLC | HFA Services LLC dba Call48 |
| IDT America, Corp | Impulse |
| Inteliquent | Intrado Communications, LLC |
| IP Networked Services, Inc | JiveTel Inc. |
| Logix Fiber Networks | MagicJack |
| Magna5, LLC | Matrix Telecom, LLC |
| Metro Fibernet, LLC | Midcontinent Communications |
| Mix Networks, Inc. | Muenster Telephone Corp. of Texas |
| Multitel LLC. | New Paris Telephone |
| NineStar Connect | Peerless Network, Inc. |
| Pioneer Telephone COOP | Piratel LLC |
| PNG Telecommunications Inc | Quality Voice & Data Inc. |
| Quantum Telecommunications, Inc. | ReInvent Telecom LLC |
| Ritter Communications | Sandhill Telephone Coop |
| Simwood Inc. | Smartedgenet, LLC |
| Socket Telecom LLC | South Dakota Network, LLC |
| T3 Communications, Inc. | T-Mobile |
| TDS Telecommunications | Technology Innovation Lab |
| Teliax Inc. | TelNet Worldwide, Inc. |
| Telnyx LLC | Terra Nova Telecom Inc |
| The Park Region Mutual Tel | Tim Ron Enterprises, LLC |
| Twilio International, Inc. | U.S. Cellular |
| USA Digital Communications, Inc. | Veracity Networks LLC |
| Verizon Communications Inc. | Vonage |
| Wabash Telephone Cooperative, Inc. | Whidbey Telephone Company |
| Winnebago Cooperative Telecom Association | Winn Telecom |